Method of making boxes



Oct. 10, 1939. c, L. CLAFF METHOD oF MAKING BOXESA Filed May 3l, 1938 4 Sheets-Sheet 1 INVENToR.

ArTRNEx/s.

CCL. 'zaff lll... llllll IVIIN |N||I||||.|||L||||II|lllllllwllfwllwllllIMIIILII Vm*- N Oct. l0, 1939. c. L. cLAFF uETHoD oF MAKING BOXES Filed May 5l, 1938 4 Sheets-Sheet 2 INVENTOR.

A TTORNEYS.

d. 10, 193.9. C, L, CLAFF 2,175,953

METHOD 0F MAKING BOXES.

Filed May 51, 1938 4 Sheets-Sheet 3 INVENTOR.

A TTORNEYS.

Oct. 1939. Q L, CLAFF 2,175,953

METHOD 0F MAKING BOXES Filed May 3l, 1938 4 Sheets-Sheet 4 (LZ. Claff A INVENTOR.

ATTORNEYS.

Patented Oct. 10, 1939 UNITED STATES PATENT oFFicE \3 Claims.

This invention relates to paper boxes such as designed particularly for holding pies, cakes, bread, and other products, one of the objects being to provide a continuous method of-manufacture whereby the boxes produced are in collapsed form. but can be set up readily and sealed at their ends in a simple and eicient manner.

A still further object is to produce boxes of this type from continuous webs of material.

A still further object is to produce the boxes by a method which permits the use of Cellophane or other transparent or semi-transparent material in the formation of windows through which the contents of the boxes are visible.

A still further object is to so fold the box at its ends as to provide a tight seal.

With the foregoing and other objects Ain view the invention resides in certainlnovel steps of the method hereinafter described and pointed out in the claims as well as in certain novel details of construction and combinationsof parts as will be explained and claimed in detail.

In the accompanying drawings the preferred forms of the boxes produced by this method have been shown as have also been illustrated the several steps followed in carrying out the method of production.

In said drawings Figure 1 is a plan view of a length of paperboard formed with scores and slits.

Figure 2 is a similar View showing the steps of folding over one side portion of the strip, applying an adhesive to the strip, and covering a blank.

`Figure 3 is a bottom plan view of that side portion of the strip left unfolded and showing the application of an adhesive to the bottom surface thereof.

Figure 4 is a plan view showing the step of applying to the spaced blanks a strip of paper designed to form the tops of the boxes, one side portion of this paper strip being folded under the blank as shown.

Figure 5 is a view partly in side elevation and partly in section taken on the line 5-5, Figure 4.

Figure 6 is an enlarged section on line 6 6, Figure 5.

Figure 7 is an enlarged section on line 'l-.l, Figure 5.

Figure 8 is a perspective view of one of the completed boxes in collapsed form following the severance of the paper web at points between the blanks of paper-board.

Figure 9 is a perspective view of one end portion of the blank following the first step o'f setting up the box and folding in the end flap.

Figure 10 is a view similar to Figure 9 showing the next step in closing the box by inturning the side wings.

Figure 11 is a perspective view of the completed box showing the final step of sealing the ends.

Figure 12 shows the iirst step in the'method of folding the end of the box by turning in the side wings.

Figure 13 illustrates in perspective the second step of folding the wings in this modied manner by moving the end iiap into overlying relation to the side wings,

Figure 14 shows the sealed end portion of the box when closed by the modied method illustrated in Figures 12 and 13. K

Figure 15 is a perspective view of one end portion of a deep box produced by the method herein described wherein the paper-board and the paper strip are of the same length and severed simultaneously from the two webs from which they are produced.

Figure 16 is a perspective view showing a completed deep box made from theconnected parts shown in Figure 15.

In carrying out the method constituting the present invention there is provided a strip of paper-board ofl proper width which is first scored longitudinally as at l and transversely, as at 2 to denne the side folds 3 and the end aps 4 of the completed blank, it being also necessary to cut slits 5 in the paper-board between and in line with the longitudinal scores I so as to divide the end folds 4 from the end wings 6 of the completed blanks. v

Following the scoring and Aslortting of the paper-board one of the side folds 3 is turned over by any suitable means, as shown in Figure 2 so as to overlie the adjacent portion of the web of paper-board W after which a suitable adhesive is applied to the exposed surface of the folded side 3 as shown at l while additional adhesive 8 is applied to the other side portion ilr on the bottom thereof.

Following the application of the adhesive the strip of paper-board is severed into blanks by cutting the strip transversely across the centers of the slots 5. When following the method disclosed in Figures 1 to 5 inclusive the blanks, as they are severed, are spaced apart longitudinally and a width of kraft paper P is then applied to the adhesive on the folded sides of the blanks while the opposite side of the paper strip, which projects laterally beyond the blanks, .is turned under the blanks and joined to the adhesive on the bottom surfaces of the adjacent sides of the blanks. These Asteps have been shown in Figure 4.

Following the application of the paper to the blanks, said paper strip is severed transversely midway between the blanks so as to produce complete boxes in -collapsed form as shown in Figure 8.

In the foregoing description it has been stated that the web W is folded prior to being cut into blanks. It is to be understood, however, that if desired the blanks can be cut of! and subsequently folded.

Itis further to be understood that if desired the paper strip, preferably kraft paper, can be formed at regular intervals with windows 9 of "Cellophane or the like so that the contents of the box when filled will be Visible.

Following the formation of a collapsed box or shell as shown in Figure 8, it will be noted that opposed ends of the paper will be exposed beyond the ends -of the paper board blank. These exposed portions can be pregummed as shown at I0.

When it is desired to set up the box and ill it, the side portions 3 are bent at right angles to the intermediate portions of the blank. The end fold 4 is then swung into perpendicular position so as to extend up to the paper P stretched between the side portions 3. Thereafter the side wings 6 are pulled toward each other so as to lap the end fold 4 and those gummed portions of the paper projecting beyond the wings S and indicated at I2 are aiiixed to the end fold 4 as indicated in Figure 10. 'I'his naturally results in the remaining projecting portion of the paper P folding to the substantially triangular form shown in Figure 10 with a portion of the gum exposed at I0. This angular flap formed by the folded paper is then pressed downwardly onto the folded wings 6 and the gummed portion I Il is brought under and aixed to the bottom Vof the box as shown at I3 in Figure 11.

The folding of the two ends of the box can be effected simultaneously after the box has been filled or one end of the box first can be sealed, the box filled, and the other end then sealed as explained.

Instead of folding the end's as stated, the folding operation can be effected as shown in Figures 12 to 14 inclusive wherein the side wings 6 are first folded inwardly toward each other after the seal has been set up, the end fold 4 then applied thereto so as to lap the same, and the flap formed by the folded paper then brought 'down over the end fold 4 and affixed to the bottom of the box as already explained and as shown by the successive steps illustrated in Figures 13 and 14.

Instead of spacing the blanks of paper-board before the application of kraft paper or the like thereto as heretofore explained, the web of kraft paper can be applied to the web of paper-board immediately following the initial folding and gumming operation, one side portion of the kraft paper being applied to the folded side of the paper-board web while the other side portion of the kraftpaper is folded under and aiilxed to the other side of the paper-board web. Following the application of the two webs they are severed transversely into blanks so that the paper and the paper-board on each blank will be of the same length. When a shell thus produced is set up, each end portion will have the appearance illustrated in Figure 15 and by then folding the side wings I4 inwardly and the bottom fold I5 upwardly to lapping relation therewith, the triangular fold of kraft paper indicated at I6, can be brought downwardly into position upon and aiiixed to the end fold I5,'thus completing the sealing of the box. ObViOUSlY the gum can be applied to the kraft paper either before the folding operation or after the parts have been folded to the positions shown in Figure 12 or 13.

In lieu of utilizing an adhesive for sealing the end folds of the box when set up, the usual interlocking features common to many types of collapsible boxes could be used. It is not deemed necessary to illustrate these.

What is claimed is:

l. The method of producing paper containers which includes the formation of separate blanks each scored and cut to provide foldable sides, side wings at the end of the sides, and end flaps bev tween the side wings, folding one side of each blank, thereafter applying the blanks in spaced relation to one side of a continuous web having an adhesive on saidside thereby to ailix the folded sides of the blanks to one edge portion of the web and leave the other side portion of the web exposed beyond the blanks, subsequently turning the exposed side of the web over the adjacent sides of the blanks and aflixing them thereto, and finally severing the web between the blanks to provide a web portion having an adhesive-containing surface projecting beyond and extending throughout the width of the wings and flaps.

2. The method of producing paper containers which includes the formation of separate blanks each scored and cut to provide foldable sides, side wings at the end of the sides, and end flaps between the side wings, folding one side of each blank, thereafter applying the blanks in spaced relation to one side of a continuous web having an adhesive on said side thereby to aix the folded sides of the blanks to one edge portion of the web and leave the other side portion of the web exposed beyond the blanks, subsequently turning the exposed side of the web over the adjacent sides of the blanks and aixing them thereto, thereafter severing the web between the blanks to provide a web portion having an adhesive-containing surface projecting beyond and extending throughout the width of the wings and flaps, subsequently folding the end wings onto the folded end flaps to apply portions of the gummed surface of the web portion of the blank to the end flaps, thereby to hold the side wings in place.

3. The method of producing paper containers which includes the formation of separate blanks each scored and cut to provide foldable sides, side wings at the end of the sides, and end iiaps between the side wings, folding one side of each blank, thereafter applying the blanks in spaced relation to one side thereby to aifix the folded sides of the blanks to one edge portion of the web and leave the other side portion of the web exposed beyond the blanks, subsequently turning the exposed side of the web over the adjacent sides of the blanks and aflxing them thereto, and finally severing the web between the blanks to provide a web portion having an adhesive-containing surface projecting beyond and extending throughout the width of the wings and aps, subsequently folding the end wings onto the folded end flaps to apply portions of the gummed surface of the web portion of the blank to the end flaps, thereby to hold the side wings in place and form spaced triangular folds the layers of which are held together by the adhesive on the web portion, a part of the adhesive on the web portion being exposed between the folds, and finally folding said triangular folded portions of the web portion onto the overlying end wings and aps and applying the adhesive exposed between the triangular folds to the bottom of the blanks, thereby to complete a sealed box.

' CLARENCE LLOYD CLAFF.

CFI 

